Stereoscope



June 17, 1924. l,498,435

C. BOUIN sTEREoscQPE Filed may 25, 1923 2. she-@1Samu '1 4 I f ya, FJ-f- 92 #A /ff f" Patented .lime 17, 1924.

UNITED sfr:

PATENT l FFicE.'

CHARLES BOUIN', OF .`BOSTON, MASSACHUSETTS.

STEREOSCOPE.

Application liled May 25, 1923. Serial No. 641,366.`

"provements in stereoscopes in which viewing stereoscopic pairs of pictures in rapid.

sequence from a film strip may-be effected conveniently and without having to hold the stereoscope in the hand.

It is an object of the invention to provide an apparatus in which a roll of film similar to the film 4used in motion picture apparatus may carry a great number of stereo-l scopic pairs of v uence, if desire rama; and to further provide in conjunction with the film strip an actuating mech` anism for advancing the picture spaces upon the strip intermittently and for retaining for a predetermined period sufficient for adequate visual sensation the subsequent Ejais of pictures before the opening inthe ga'teto' be viewed through stereoscopic eye pieces.

With thecforegoing `and other objects in view, the invention will be more fully described hereinafter, and will be more particularly pointed out in the claims appended hereto. 7

In, the drawings, wherein like symbols Cpictures depicting in se- -lrefer to like or corresponding parts throughv out the several views,

Figure 1 is a top plan view, with parts in section, showlng an improved stereoscope constructed according to the present inven- `4() tion.

Figure 2 is a front elevation thereof, and Figure 3l is a side elevation with the film removed for clearness.

`Referring more particularly to the drawings, 1 designates a bed plate upon whichis fixed a bracket 2 at an intermediate vrear and lefteyes of the beholder.

The lm gate is .adapted to slidably receive the film strip 5 which maybe of an opaque or translucent character and which the several phases of al is initially carried', for instance byl a spool 15 detachably mounted at one forward corner of the bed plate to admit of its removal and substitution. After passing through the film gate, the film strip 5 is rewound upon a companion spool 15', pulleys 16 and 16 "being fixed to the spools respectively and engaged by a crossed belt 17 to enable the spools to rotate in unisonr The film strip 5 derives its intermittent movement from contact with sprockets12 which engage the perforated margins of the film and in theinstance shown the sprockets are mounted at one end of the film gate and in rear of the receiving sprocket 15. It is to be understood that, although I have referred to thespool 15 as the original container forv the film, the order may be reversed without affecting the principle of the invention.

Adjacent the sprockets 12 is a pressure Y roller 14 carried upon the free end of the curved Yarm 6 pivoted u on the bed plate 1 and having a handle 2? by which it may be adjusted angularly for the purpose of increasing or decreasin the pressure upon the film strip. The han 1e 27 projects outward-v ly beyond the side edge ofthe bed plate where it maybe conveniently manipulated and, after adjustment,the parts are secured by a set nut 13.

The sprockets 12 are driven through a pinion 11 coupled to the shaft of the sprockets and extending beneath the bed plate 1. The pinion 11 is disposed in mesh with a gear wheel 10 mounted on. the same shaft with a Geneva gear9 which extends above the bed plate 1 and is inthe form of a Maltese cross having slots 9 between the arms ofthe cross and extending substantially radially, .while the outer ends of said -arms are rounded or curved to conform to the periphery of a drum 8a which rotates in contact with such curved outer ends' of the arms. The drum 8a moves with a drive disc 8 above which it is disposed, said drive disc being rotated by a handle 7 upon a crank or extension 7 secured to rotate said disc. The disc 8 is provided with al pin 8 adaptedto take into-the slots 9 in the Geneva gear 9 and the drum 8 is cut away or. slotted opposite lthe'pin as shown in Figure 1 in order to receive the arm of the Geneva gear following the piii. The engagement of the circumference of the drum with the curved outer end of the arms of the Geneva .gear serves to avoid any. accidental or casual v movement of the hlm driving, mechanism during the interval that the pictures remain clining movement.

vstationary before the opening :in the ilm gate. 'llhis is important in order that v1sual sensation may take place without any interference. I

'llhis visual sensation takes place through prismatic lenses 21 and 21 carried in eye pieces 18 and 18 which are mounted in the trame 19 movably carried by a pair ot rack barsv 22 which are slidable in the bearings '28 upon the torward edge Vot the base plate.

Pinions 23 on a shaft 24 mesh with the rack I bars 22 and by turning the head 26 onthe outer endof the shatt 24C the adjustment ot the eye pieces back vand forth or toward and from the iilm gate may be effected. 'llhe shaft 24: is journaled in appropriate bearings 25 secured to said bed plate.

' 'llhe bed plate itselfV is carried upon a semicircular bracket 35 having downwardly clepending danges receiving therebetween a head or block 34a carried upon the upper end of afthreaded shaft31 which engages within a tubular post 30 mounted upon a heavy base plate 29. By rotating the shaft 31 the.

bed plate and apparatus carried thereby may be elevated or lowered. .A set screw 30 taking into the hollow post 30 provides for, locking the parts in the adjusted position..

The bracket 35 is secured tothe under tace ot the bed plate 1 at substantially a central point by the use ot the tastenings engaged justed by manipulating the head 26 to Secure the proper focal distance suitable to the beholder and the action is begun by 'rotating the end crank 7. Suitable pressure is of course put upon they tilm by the adjustment of the pressurelroller 14. 'llhe turning ot the handle 7 brings the pin 8 ot the drive disc periodically in the successive slots 9 of the Geneva gear 9' and consequently intermittently rotates the gear wheel 10. An intermittent movement is thus transmitted to the pinion 11 and to the sprockets 12 which results in a drawing of the film through the `film gate. 'llhe ratio of the gearing is such that at each successive movement, the iilm i will M drawn a distance corresponding to the distance ot two of the stereoscopic im ages so that a subsequent pair .ot images will each time-be brought intoafccurate registry ineens@ vbetere the apertures in the gate. During the interim the lm will be held against any casual movement and the hlm will be wound and unwound uniformly due to the drive connection between the spools. 'llhe sprockets will of course pull the film trom the initial spool iand the initial spbol will 1drive the rewind spool through the belt 17.

llt will be appreciated that through the vertical and inclining adjustment adorded by the pedestal upon which the base plate is mounted that the device is suitable tor persons ot all sizes; while the adjustment atorded the eye piecesaccoodates the apparatus to great variations in vision. 'lhe apparatus will provide lor viewing'a vlarge c number kot pictures contained upon the strip ina short space ot time and without ,A

abating the interest which the inconvenience and labor ot replacing by hand single stereoscopic pictures always entails.

.lt is obvious that various changes and modiiications may be made in the details oit construction and design ot the above speciii# cally described embodimentfot this invention without departing trom the Ispirit thereof, such changes land modiiications being restricted only by 'the scope oil 7the tol-4 log claims.

l. A stereoscope or the like comprising a bed plate, a gate thereon having a pair of apertures, a having numerous pairs oil stereoscopic pictures adapted to pass through said f. gate, a Geneva movement for driving said through said gate, and adjustable eye .pieces for. viewing said 2. A. stereoscopey or the like comprising a bed plate, a gate thereon having spaced apertures, spools tor holding and rewinding a strip having stereoscopic pairsot pictures, drive means between said spools including a Geneva movement tor urging said iilm through said gate,-adjustable pressure means tor engaging said tilm between the gate and the Geneva movement, eye pieces tor viewing the lilm, and means tor adjusting said eye pieces toward and from the gate. Y

3. A stereoscope or ythe like comprising a base, a tubular threaded post thereon, a threaded shaft in said post, means to hold lill the sha-.tt against movement, a block carried by said shaft, a 4bed plate, a bracket on the bed plate having depending danges received upon and pivot to said block, means to hold the bed late against pivotal movement on the bloc a continuous strip having stereoscopic pairs of pictures carried on said bed plate, means for-intermittently advancing said tlm strip, and adjustable means for viewing thel pictures.

1l. A stereoscope or the like comprising a Y rae movable through said film gate, a sprocket for engaging said lm, and a Geneva movement for turning said sprocket intermittently comprising a gear having a number4 of radial arms with slots between the arms,

said arms having curved outer edges, a rotary driving disc having a pin adapted to enter lsaid slots'in sequence, and a drum carried by said disc for engaging the curved outer ends of said Varms and having a slotted part opposite the pin to receive an arm of the gear.

5. A viewing apparatus comprising a film gate, spools at opposite sides of said .film gate orcontaining and receiving a lm strip having a series of pictures thereon, a Geneva gear for moving said lm strip Aintermittently past said gate, pressure meansv for the film strip adjacent said gate and aol-v justable `eye pieces arranged at opposite sides of said ilm gate.

6. A viewing apparatus comprising abed plate, film spools thereon, a film vgate for re-` !ceiving the ilin from one spool, a Geneva motion for moving said, lm intermittently,

vdrive means arranged between said spools,

gate adapted to receive a film having aseries of pictures thereon, a sprocket for moving said film throughthe gate, a Maltese cross gear connected to said sprocket and having slots between the arms of the cross and curved outer faces on said arms, a drive disc adjacent the gear having a pin adapted to enter the slots between said arms and hav.-

ing ajdrum adapted to engagelwith the curved outer ends of the arms, said drum having a gap .therein adjacent the pin, means `for rotating the disc, and eye pieces for viewing the film.

In testimony whereof l ax my signature.

CHARLES BOUN. 

